Features:
1) Diffusion dialysis provides an attractive acid recovery method from the view
of energy saving
2) It relies on the great difference in the diffusivity between acids and salts
and the only external power is required to circulating the solution
3) The separation of acid from salts is achieved by using an anion exchange
membrane which has a tendency to allow the selective transport of anion
across the membrane, while ideally remaining impermeable to cations other
than protons because of their small volume and less positive charge
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